首页|Depth distribution of three submerged macrophytes under water levelfluctuations in a large plateau lake
Depth distribution of three submerged macrophytes under water levelfluctuations in a large plateau lake
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Submerged plants are crucial for maintaining a clear water state in lakes, and their distribution area is usuallydetermined by the lowest distribution boundary (LDB). However, LDBs of submerged macrophytes often exhibitspecies differences and vary with seasonal water level fluctuations. In this study, we carried out a three-year fieldinvestigation to compare differences in the LDBs of three submerged macrophyte species (i.e., Vallisneria natans,Ceratophyllum demersum, and Potamogeton maackianus) and explore their distinct determinants. We assumed thatLDB differences would exist among the three species and that water level (WL) would be a key environmentaldriver of LDB dynamics, with an association between the LDBs of submerged macrophytes and water levelfluctuations. Indeed, our results showed significant seasonal differences between C. demersum and V. natans inthe period of September - May, with mean annual values in the order (low to high) V. natans, C. demersum, andP. maackianus. Furthermore, water level was a major driving force of the LDB dynamics of the three species.Changes in the LDBs of the three species in response to water level fluctuations could be divided into threeperiods: i.e., recovery growth period (April to June), stress tolerance period (July to September), and recessionperiod (October to following March). This study not only clarifies the impact of water level on submergedmacrophyte growth and distribution, but also has larger practical implications for the ecological restoration andmanagement of large deep lakes.
Water levelSubmerged macrophytesLowest distribution boundaryEcological restoration
Zihao Wen、Hao Wang、Zhonghai Zhang
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State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Chinese Academy of Sciences, Wuhan 430072, China
a State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Chinese Academy of Sciences, Wuhan 430072, China
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